Why hydrogen absorption lines are weak in o and m stars
What is the fundamental explanation (in terms of atomic physics) of why hydrogen absorption lines are weak in O and M stars and strong in A stars. Why are molecular absorption lines strong in K and M stars but weak in O, B and A stars?
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What is the fundamental explanation (in terms of atomic physics) of why hydrogen absorption lines are weak in O and M stars and strong in A stars.
Use methods of descriptive statistics to summarize the data. Comment on the findings.
Sketch a Hertzsprung-Russell diagram: label the axes, marking off the scales. Indicate the regions on your diagram occupied by main sequence stars, red giants, supergiants, the Sun.
Describe how we measure distance using "spectroscopic parallax". What is the practical limitation in using this technique, and what is the approximate distance (in parsecs) out to which this technique is useful.
Suppose that star B also only has half the surface temperature of star A, what is the energy flux from the surface of star B compared to star A? What is the ratio of the radius of star B over the radius of star A.
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